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Novel Ultrathin Mg Nanoblades for Hydrogen Storage

Published online by Cambridge University Press:  31 January 2011

Fu Tang ,
Gwo Ching Wang  and
Toh-Ming Lu
Fu Tang
Affiliation:
[email protected], Arizona State University, Physics, Tempe, Arizona, United States
Gwo Ching Wang
Affiliation:
[email protected], Rensselaer Polytechnic Institute, Physics, 1C25 Science Center, 110 8th Street, Troy, New York, 12180, United States, 518 276 8387, 518 276 6680
Toh-Ming Lu
Affiliation:
[email protected], Rensselaer Polytechnic Institute, Physics, Troy, New York, United States
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Abstract

We describe the growth of novel ultrathin Mg crystalline nanoblades by oblique angle vapor deposition. These nanoblades were then coated with catalyst Pd and hydrogenated into magnesium hydride MgH2. In situ thermal desorption spectroscopy study showed a low H desorption temperature at ∼365 K. In situ reflection high energy electron diffraction patterns were used to study the temperature dependent structure and composition changes during the de-hydrogenation of Pd coated MgH2 nanoblades. The diffraction rings reveal the formation of alloys of Pd and Mg when the temperature is over ∼480 K. Transmission electron microscopy diffraction also supports the formation of Pd and Mg alloys. This alloying reduces the cycling capability of Mg hydride. The de-hydrogenation of MgH2 introduces a strain at the bilayer interface between MgH2 and Mg resultant from 30% volume reduction from MgH2 to Mg and formed curved nanoblades as evident by scanning electron microscopy images. Designing factors of recyclable simple hydrides will be discussed.

Keywords

HMgRHEED
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1216: Symposium W – Hydrogen Storage Materials , 2009 , 1216-W05-02
Copyright
Copyright © Materials Research Society 2010

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